An Efficient Method of Eliminating the Range Ambiguity for a Low-Cost FMCW Radar Using VCO Tuning Characteristics

This paper describes a simple method of eliminating the range ambiguity and the design approach for low-cost and small-size homodyne frequency-modulated continuous-wave (FMCW) radars. The range measurement accuracy could be efficiently improved by proper time gating of the beat signal without any cl...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-10, Vol.54 (10), p.3623-3629
Main Authors: Park, J.D., Kim, W.J.
Format: Article
Language:English
Subjects:
Ambiguity
Applied sciences
Bandwidth
Circuit properties
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Fast Fourier transformations
Frequency
Frequency shift
Frequency-modulated continuous wave (FMCW)
Gating and risering
Linearity
Low-frequency noise
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Oscillators, resonators, synthetizers
Radar
Radar applications
Radiolocalization and radionavigation
range resolution
Sensor systems and applications
Signal resolution
Telecommunications
Telecommunications and information theory
Transmitters
Tuning
Voltage-controlled oscillators
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Summary:This paper describes a simple method of eliminating the range ambiguity and the design approach for low-cost and small-size homodyne frequency-modulated continuous-wave (FMCW) radars. The range measurement accuracy could be efficiently improved by proper time gating of the beat signal without any closed-loop linearity compensation circuitry for typical varactor-tuned voltage-controlled oscillators (VCOs). The presented selectively gated fast Fourier transformation method is immune to the frequency shift of the VCOs. A W-band FMCW radar using a raw varactor-tuned VCO having the percent linearity of 7.16% was implemented, and achieved less than 2% ranging error of the target lying at 200 m. Owing to the simple structure and fast processing speed, this method is applicable to the various low-cost radar sensors for ranging and detection
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.882869